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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b521cd059c288b8dd49cd6b58927934aa623b67d3d173ebc447813c0864065ea' 
  AND token = '5WAv7szr+hnpbV67VL3w45DH25VXCE059K7kbySP6WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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