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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9cf6d95f6dc62e205b74fed36bc8213c6db7423a56bb1b58a180585392e158' 
  AND token = 'H6vNdFzUoxackRfCtIu7ypZL+CpUvfIRNEVakpZFYQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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