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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbfe3ee71234cf72793d3843103eff0c35ed7552f8234ca9f01c741c5cd3584' 
  AND token = 'JB9XzTWSiBZR4E7pANX+atDmvNIAvk8ObHCv+cXRxGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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