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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37efe4abdb4d3b68440c752e7428b9a901717cbd46b7a15b2dcc4cf46351a434' 
  AND token = 'chumRzmwN9p2J6I/orXomcJ/inFsEUT3YaSrAAO3Nyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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