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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0817ff1a15cace5f9303f5edfe076aae642917ae6a2e4005750ae43511bbb8' 
  AND token = 'R4fVpPRHADXLa8fkNa6R3gY6A7pVL+zclxlMCy1+x4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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