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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93cee423dc7a23ffa1db49835feace92482b1028de0cbb38f5248ff7d5cd326' 
  AND token = 'oYJ8RpexjpuReWc6dJLELwijAvKyaaja/2H5F3ZZWw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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