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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cef3d34fa4d67147dfc0e9d0b1db2d67751f2b86dcbea77cc8e43aa6b0dda7' 
  AND token = '9coAVeeO6ibk1uiVdKtN1x3FDLyRQfGvbrIZC6BxMfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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