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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cc2616bac7ad6f2ecaaabbac8010810f644ce718f7dee0091916985737f0c7' 
  AND token = '2/S5Q7F2zSTSxoqZhsYvjDVDTfDTwAVSg+8EpaL0yg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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