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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c119d499dee89ca6c5989f8e0e7671f425a6350a7d494fb89d4a85d5ae3544' 
  AND token = '7OFCZuAv6TiigUAS55/rN1A0dtk6ZcPFBUgakA/VcVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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