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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea7d0ea07a29158638335927e291c3cd79c3b1621ccedf7147b9ca91fbb5b58' 
  AND token = '7V8MYZVGPWomnnPwMC3/McVTdBMVJ9rnbXAP1YdN4xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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