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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c5b65721e196ad1c65888b3a655c3d1fadfd6ddf70fab3d2d6e7ff20d4c031' 
  AND token = 'rG63MIjebh+Jl5H/nikL10B7oCgM3QtRqJj82mJhQZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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