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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7470ee197d4295678aa097a73beb7db7fe1155c9410b9a98725c9faa0a0b894e' 
  AND token = 's2GBlnkW8FJXH0Ok54KyPc6LpGZ1nF3+/7RjIhp39u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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