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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6aaa618e99c70e45cd269518571f78661f390add9fb4c5738870eaa4460acfd' 
  AND token = 'kCL+L2u6l+TULdQzYRfpGGUfTdYEZMDjXV9A9YPHKIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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