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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd0b0644794da4dd1b458a9285f14f95e6382ff34e6f7f1a646af0baff43507' 
  AND token = 'tFXgoYxARFzS8uSOcG8xmYD5KX10DSespFRO5iV4C+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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