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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbaa29d3197f209470f8b43f5dc4addbcbec197bb7fd76d7b270fe53b2eed9b' 
  AND token = 'nxXr48fsvLf3NQgRd3QR5ubGOV/mirejiaD/bzfmc0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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