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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475a31c7f224d532d25b79d4ee8cfb78ea2ee143de5068eb23e3533ef324e681' 
  AND token = 'dWQC/4y9B6LwAWU4tB8MC7CLL7G6OTBmPMFgKkJdWks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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