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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfe1a0cc7761871ad6e90eb22ad926835f49c050cfccf2e4d21cebccaa5611a' 
  AND token = 'ftKDPADIBPIZg8Z62RoNflcR1b1yrjRyQex7iw2Tm7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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