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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fa2f767e3d63296b6edfc8d3fc7d07acaae96b0c5826542ed4d2c1c7372eb0' 
  AND token = 'VGqhRJWTf2CIBLBBHl0RVfPjb9iMCaph7Y75xH997sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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