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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2def73cc289a1cb147d3f9766968a31abdba26c1f83c9017ff92ca3fa1ef603' 
  AND token = 'vs9BeuXXq0yLUUKCkwyQVXi7ixW/7dhPy6yEnpvTLEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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