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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf90ab3504a760b1036360bc5aa2a3c2de14884a42da12396a02c412aff69a44' 
  AND token = 'n67oJX32o8pB80+M6Vn6W6I2byTIhPTPRVaKb+xrfow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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