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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d5e47dc481622804320fe1bbc1b90c91d6c90ec14a80765897426d4bddc732' 
  AND token = '+B0rSVgBsIbaEp6bsH695JF2i5N9pSbgLLg0bp9CE2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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