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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063d1f7a0920739c4c42034f6cca726ee264b5f968304e62e1c277e54a2dd07d' 
  AND token = 'BHnEHBr/OeTDQAc23HiE0sZotbaYc8kDRae4XUVzhyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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