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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e8e087c7f037a7673b6817619b853c98854731f2e88a409dfa53d687599ce4' 
  AND token = 'sTHP4LBP5uHc7TCDJ17SX78mJ1rwAOV/B/pOfd3Qst8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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