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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112cd77565e18ae78e05513fd22c1259d1c85775415e52ae169d1043e51dd7d6' 
  AND token = 'nnh7ctYMPQ7yRnB9DNrE4o55AVDDzm57qbntFRtWIsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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