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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0779d17e317ad2c6fee9f127e2254cd098ebe0254803a91845759c4051dc7f61' 
  AND token = '5R8X6+OkBQo8Sds3cSD5g2g5wrxQvj47aCMruB46khk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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