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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abeeb6092f6396f45cbcb33971e85a172cbc94f94d50aa82aaa3cab738266f7' 
  AND token = 'OpS5mZeidK2TGAcob1od0gQ/bk+za2/SSg8wRk6OzFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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