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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce5bb5b7c77d5c7cdd6fa714584acdd26cf96f2133e9ba7fe4263930a13f5cc' 
  AND token = 'X4MZMqfKCNWXpunB8TEJ9QakFh1uwyMJWwGOK3tlteM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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