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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b98f0f86d65c2783d1a451190260a92a32b3e1bf7af48c74cc58b5e4a1d2a3' 
  AND token = 'vrU0p7C+OHYc2Rn65RZj/d3Uu5jpOUBPXDx7vHOjxxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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