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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d3f0b83db0767017d839fdca50f1d559d585a446ccd7bdb78b62b20ee71a01' 
  AND token = 'NAzn1/KCvrgp4g5tp2gd3vtdXphiItk9Pt1JAu8XXqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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