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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb077b24fb65dd9193630d0b2d543fddfbf04303384edf4683d4999a5638df0f' 
  AND token = 'z39AHeMPN/OTQlQo4mfR+Dt6ZUTN8ln/Ph1ziatfcVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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