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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b148454d7a3152b7b29a0ac49936c42ccfa20d190c3afc14ab2442b71d9793a6' 
  AND token = 'vufA9X86PWb1sw7LtnahL1rAtCqR7m3zoF3Mlu3mi1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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