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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef82c142fdc90c88a2d632136806bfe80f632bec39fd5544a456bcf1d2fa5f9' 
  AND token = 'r1famIBp2qt8iQvrDtYSCpOqMAlWRS8w6mGSf56ONho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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