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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc51a791bfbb0563c71cb7d24d5f3b170e692ba19ee7f967942818a9df676bb0' 
  AND token = 'E5a+5lpz3DUdYgC+ingstZ3UkylMm5vrO2Qnn0AOLnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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