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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9f93890ac75267cbfce4195715e70d70b000bc867dcf737eb33a14ba07d8d3' 
  AND token = 'IVERfVbYrgVLs1W0Y/OBLp1k6Rn+otxeVvxYP0SN2e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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