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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd858c8afbb39a59af106c3a5a7e47e189dd0b8a4336ca8304281b0a24268b07' 
  AND token = 'g3csnps0zDFwEXMTmpkxC0pAdGVlX1qcaLICy+3fFIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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