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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6981605cdd8cd3ae3509df0b58c06522a60ec63ad5cfa6d87b6345173ca024' 
  AND token = 'p1+j01gaZAGBMZmTMifO19DPARLmy+oqyEt2k38HWf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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