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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cc1761220c67cc43b3d44febdab3b331c8ceec2b8964d5619e11b83588342a' 
  AND token = 'eR0y2WyHh0Eh5InlIpp/1aojSFeiq6jTF8unLB6joPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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