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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d11ebb2bc28f77c58fbb2a460fc067d6e3df67ac1d650c8ad90e23b30dbdd0' 
  AND token = 'laywiP5ZVNaJ8ZJmvbNKjk82aLc/Cn+I+uhJJVSonjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}