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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b1d9294749cac97a0d10b15a3cd75bc098b589ba6477602ca7d359b174166a' 
  AND token = 'I1KsECsqrSi+YjYxBxclQ07UbuOBLAGi9u/5Dk0uKgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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