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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371ef552b0780bf3c8dca20a887792dd86700764af0fbd4f04c6f673134ff4d6' 
  AND token = 'DbJiyHRzYTjAVz/G/vElvHSmai8FVHpqouc9cu4E3rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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