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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50da68f6433d9aaa3452940ac63749e41cf9132856535a24db49b73b011743d' 
  AND token = 'VE5O7gOx3pCx+gL6UnW5Tu6eD9Pz0SD56CvrdDlKC90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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