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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c986c305086847b08ad8d3fe40cc0e8733b03500500ba2433a4df4eeb55c1027' 
  AND token = 'HCXHcmGsjRs1praTykcyiW4HY5YxCaGGM53liIBIuzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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