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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd764508edb5c06d5a83d1a8a5ace05bb2359b6c7c6ddce2fdd7543f4ad640d8' 
  AND token = 'uKAxpwSbTPc+m4lmlR1MF9VjRTp7cXlZytVJkAYR0lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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