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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1d7724e45c1c934e5a38266dc16ef688ac69d2c4f34cac27dcf17538899f46' 
  AND token = 'mHTx2aeInzN260yn84fxG0mbs4XlXUMpJNDW3oL6zFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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