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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c551bbdd08c51f33852dde307c8f6820a09eb56fec2653ecdfcfe857a5b37e3' 
  AND token = '1Nm4zEt/Xhq5VCR9PKxOCT3YWP6FL8BfTFq3XtyDr1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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