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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071e0957ada3c1ec8676948bdcdc1e756349f9f8c2748bfa182bc92666d2b866' 
  AND token = '8vx68E5fYY4QlcnBci/aT3oIsmVnz4lsyf5UmXu48Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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